<!--
function adArray() {
 for (i=0; i*2<adArray.arguments.length; i++) {
  this[i] = new Object();
  this[i].src = adArray.arguments[i*2];
 }
 this.length = i;
}
function getAdNum() {
 dat = new Date();
 dat = (dat.getTime()+"").charAt(8);
 if (dat.length == 1)
  ad_num = dat%ads.length;
 else
  ad_num = 0;
 return ad_num;
}
var ads = new adArray(
"/medical/one.jpg"," ",
"/medical/two.jpg"," ",
"/medical/three.jpg"," ",
"/medical/four.jpg"," ",
"/medical/five.jpg"," ",
"/medical/six.jpg"," ",
"/medical/seven.jpg"," ",
"/medical/eight.jpg"," ");
var ad_num = getAdNum(); 
document.write('<CENTER><TABLE CELLPADDING=0 CELLSPACING=0 BORDER=1><TD><IMG SRC="'+ads[ad_num].src+'" '
+'WIDTH="60" HEIGHT="50" BORDER=0 name=js_ad></TD></TR></TABLE></CENTER>');
link_num = document.links.length-1;
function rotateSponsor() {
 if (document.images) {
  ad_num = (ad_num+1)%ads.length;
  document.js_ad.src = ads[ad_num].src;
  setTimeout("rotateSponsor()",5000);
 }
}
setTimeout("rotateSponsor()",5000);
// -->